NDLI: An Iron Impurity in Multiwalled Carbon Nanotube Complexes with Chitosan that Biomimics the Heme-Peroxidase Function

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An Iron Impurity in Multiwalled Carbon Nanotube Complexes with Chitosan that Biomimics the Heme-Peroxidase Function

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An Iron Impurity in Multiwalled Carbon Nanotube Complexes with Chitosan that Biomimics the Heme-Peroxidase Function

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kumar, Annamalai Senthil Gayathri, Prakasam
Description	Author Affiliation: Gayathri P ( Environmental and Analytical Chemistry Division, School of Advanced Sciences, Vellore Institute of Technology University, Vellore-632 014 (India), Fax: (+91) 416-2202754.)
Abstract	A new biomimetic functional system having an impure multiwalled carbon nanotube (MWCNT-Fe)–chitosan biopolymer $(H_{2}N–CHIT)$ chemically modified glassy carbon electrode $(GCE/[MWCNT-Fe:H_{2}N-CHIT])$ has been developed and demonstrated efficient hydrogen peroxide electrocatalytic and electrochemical sensing applications in pH 7 phosphate buffer solution (PBS). The hybrid system showed a stable and well-defined surface confined redox peak at an apparent electrode potential, E°′=−0.22 V versus Ag/AgCl with surface excess value $13.63 nmol cm^{−2}.$ Physicochemical characterizations of the hybrid by using FESEM, TEM, Raman spectroscopy, FTIR, and various control electrochemical experiments revealed that the iron impurity in the MWCNT interacted with the amino functional group of the chitosan polymer and thereby formed an unique complex-like structure $([MWCNT-Fe^{III/II}:NH_{2}-CHIT]),$ similar to heme peroxidase with a central $Fe^{III/II}-redox-active$ site. The biomimetic system followed Michaelis–Menten-type reaction kinetics for the $H_{2}O_{2}$ reduction reaction with a $K_{M}$ value of 0.23 mM. At pH 7, amperometric i–t sensing and flow-injection analysis of $H_{2}O_{2}$ on the biomimetic system showed calibration plots in windows 5–500 and 50–2500 μM, with detection-limit values of 2.3 and 9.7 μM, respectively. Unlike most of the previously reported systems that undergo serious interferences in physiological pH, the biomimetic system displayed a remarkable tolerance to other co-existing interferants (such as cysteine, ascorbic acid, uric acid, nitrate, and nitrite), at a $H_{2}O_{2}$ detection potential similar to the peroxidase enzyme. The ability of the biosensor system to perform routine analyses was demonstrated by the detection of $H_{2}O_{2}$ present in simulated milk and clinical and cosmetic samples with appreciable recovery values.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	50
Volume Number	19
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2013-12-09
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Biopolymers Chemistry Chitosan Heme Hydrogen Peroxide Metal Nanoparticles Nanotubes, Carbon Peroxidase Electrochemistry Electrodes Limit Of Detection Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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